Table 4.

Correlations between PROBE and EQ-5D-5L items (convergent validity)

EQ-5D-5L	PROBE	Correlation	95% CI
Mobility	Q.9 Mobility aids	0.42	0.35 to 0.47
Pain and discomfort	Q.10 Pain medications	0.55	0.50 to 0.60
	Q.11.1 Acute pain (activities)	0.42	0.36 to 0.48
	Q.11.2 Acute pain (interference)	0.39	0.32 to 0.45
	Q.12.1 Chronic pain (activities)	0.56	0.51 to 0.61
	Q.12.2 Chronic pain (interference)	0.57	0.52 to 0.62
Self-care	Q.13 Activities of daily living	0.65	0.61 to 0.69
Usual activities	Q.13 Activities of daily living	0.71	0.67 to 0.74
Anxiety	N/A	N/A	N/A
Utility index score	Total score	0.67	0.62 to 0.71

EQ-5D-5L, EuroQol five dimension 5-level instrument; EQ-VAS, EuroQol visual analogue scale; N/A, not applicable; PROBE, Patient Reported Outcomes, Burdens and Experiences.